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Surface integrity after post processing of EDM processed Inconel 718 shaft
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- Holmberg, Jonas (author)
- Högskolan Väst,RISE,IVF,University West, Sweden,Avdelningen för avverkande och additativa tillverkningsprocesser (AAT),Manufacturing Swerea IVF AB Mölndal Sweden,PTW
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- Wretland, Anders (author)
- GKN Aerospace Sweden AB Trollhättan Sweden
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- Berglund, Johan (author)
- RISE,IVF,Manufacturing Swerea IVF AB Mölndal Sweden
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- (creator_code:org_t)
- 2017-11-22
- 2018
- English.
- In: The International Journal of Advanced Manufacturing Technology. - : Springer Science and Business Media LLC. - 0268-3768 .- 1433-3015. ; 95:5-8, s. 2325-2337
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Electrical discharge machining (EDM) is considered as an efficient alternative to conventional material removal concepts that allows for much higher material removal rates. However, EDM generates unwanted features such as re-cast layer (RCL), tensile residual stresses and a rough surface. In order to recover the surface integrity, different post processes has been compared: high-pressure water jet (HPWJ), grit blasting (GB) and shot peening (SP). Surface integrity has been evaluated regarding microstructure, residual stresses, chemical content and surface roughness. The results showed that a combination of two post processes is required in order to restore an EDM processed surface of discontinuous islands of RCL. HPWJ was superior for removing RCL closely followed by grit blasting. However, grit blasting showed embedded grit blasting abrasive into the surface. Regarding surface roughness, it was shown that both grit blasting and HPWJ caused a roughening of the surface topography while shot peening generates a comparably smoother surface. All three post processes showed compressive residual stresses in the surface where shot peening generated the highest amplitude and penetration depths. However, the microstructure close to the surface revealed that shot peening had generated cracks parallel to the surface. The results strongly state how important it is to evaluate the surface at each of the different subsequent process steps in order to avoid initiation of cracks. © 2017 The Author(s)
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik -- Bearbetnings-, yt- och fogningsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering -- Manufacturing, Surface and Joining Technology (hsv//eng)
Keyword
- Abrasive water jet
- EDM
- Grit blasting
- Inconel 718
- Shot peening
- Surface integrity
- Abrasives
- Blasting
- Cracks
- Electric discharge machining
- Electric discharges
- Jets
- Microstructure
- Residual stresses
- Surface roughness
- Surface topography
- Compressive residual stress
- Electrical discharge machining
- High-pressure water jets
- Inconel-718
- Tensile residual stress
- Fighter aircraft
- Production Technology
- Manufacturing and materials engineering
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Berglund, Johan
- Beno, Tomas
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